| A | B |
|---|
| acute angle | less than 90 degrees |
| right angle | 90 degrees |
| obtuse angle | more than 90 degrees and less than 180 degrees |
| straight angle | 180 degrees |
| reflex angle | more than 180 degrees and less than 360 degrees |
| supplementary angles | two or more angles whose sum is 180 degrees |
| complementary angles | two or more angles whose sum is 90 degrees |
| vertical angles | two angles opposite each other when two straight lines intersect |
| transversal | a line that intersects two or more parallel lines |
| equilateral triangle | triangle with three equal sides |
| isosceles triangle | triangle with two equal sides |
| scalene triangle | triangle with three sides having different measurements |
| right triangle | triangle with one right angle |
| hypotenuse | on a right triangle, the long side across from the right angle |
| legs | on a right triangle, the two sides other than the hypotenuse |
| corresponding | matching sides of similar figures |
| similar triangles | angles are equal and sides are proportional |
| congruent | having the same size and shape |
| Pythagorean theorum | the square of the hypotenuse = the sum of the squares of the other two sides |
| angle | two lines extending from the same point |
